After market ECU; konverzija na EFi ubrizgavanje

[Nenad]

I kakav BSFC ce biti sa turbinom?

Sad bi Boost rekao da njegova formula uzima sredinu 0.55... =]

Ovo je srednji pokazatelj (0,55-0,6) za motore sa nadpunjenjem, ali ne znaci da ce i dani motor imati takav BSFC.

[Miljan3]

sve je to fino al oceli neko meni da objasni st vi nazivate BSFC?

[duxducis]

Kapiram, pa bolje onda racunati sa 0.65 do 0.7 sto je max za turbo motore.

[BOOST]

Faktor , koliko od goriva koje je uslo u cilindar bude iskorisceno za guranje klipa , onako, na lakom jeziku

[duxducis]

BSFC brake specific fuel consumption

[Nenad]

Nenade >> 4 630cc injektora daju sda Nirom na SAAB motoru 530 KS.

Motor ide na ivici siromasne smese, masti samo po potrebi prema temp izduva.

Boost,

govoris o 630cc na 3Bara ili 630cc na pritisku koji je u tom konkretnom motoru?

Alex treba da odredi i DC dizne jel' od DC i BSFC zavisi koliko ce realno goriva da se ubrizgava.

Alex,
Koliki je pritisak goriva kod tebe?

[BOOST]

Ako bude relevantno bice 3,8 bara osnovni pritisak.
DC injektora sa mAX 90

SAAB je teran sa Baznim pritiskom 3,8 bara

Temperatura izduva 970 C

[Nenad]

Mislim da cemo svi razumeti

BSFC is the measure of how effectively an engine takes advantage of the fuel in its combustion chamber. SFC is usually measured in lb/hr/HP or cc/min/HP, and traditionally good values are 0.40 lb/hr/HP (4.2 cc/min/HP) or lower; newer engines with better airflow numbers, and fuel and spark management have lower numbers. As the number gets bigger, the engine is using more fuel to make less power, so you want this number as small as possible. (Turbo and supercharged engines are notorious fuel gulpers and often have SFC numbers of 0.55-0.60 lb/hr/HP.) Note that improvements in SFC affect power output in a direct linear proportion. If at a given flow and AFR you can improve SFC from 0.50 to 0.49, you have increased power by 2%.

SFC is a function of many factors, not the least of which is static compression ratio. Increasing CR increases thermal efficiency, which directly affects SFC. Lowering the rod to stroke ratio can improve SFC to a point due to combustion pressure being applied when the crankshaft at a more advantageous angle (but it also induces greater frictional losses from piston side forces). Use of cast iron or thermal barrier coated cylinder heads, instead of bare aluminum, keeps heat in the chamber and lowers SFC. Likewise, use of thermal barrier coatings on valve faces and pistons drops SFC. Reducing internal engine friction and pumping losses improves SFC, so port your lubrication and cooling systems.

Combustion chamber design has a huge impact on SFC. A chamber with stratified charge (one where AFR varies at different places in the chamber, typically rich near the plug, but lean away from it) or lots of swirl usually was designed to improve SFC. Small, compact chambers which cause the charge to burn rapidly often have a lower (better) SFC than extended, flat ones. Placement of the spark plug in the chamber is important: a central location allows for a faster more efficient burn than an off center one.


Zato i kazem da je uvek bolje izmeriti konkretan BSFC za dani motor nego posle davati vise novca.

[Nenad]

Ako bude relevantno bice 3,8 bara osnovni pritisak.
DC injektora sa mAX 90

SAAB je teran sa Baznim pritiskom 3,8 bara

Temperatura izduva 970 C

Onda moze da se izracuna (otprilike) da ce sa diznom od 545-550cc/min na 3 Bara BSFC 0,57 i DC 90% da gura oko 840cc/min. Ako na ovo dodas jos pritisak od 3,8 bara umesto 3 Bara bice preko 900cc/min

Moje su dizne sada 273cc/min na 3 bara, auto pravi 4 bara na liniji i DC mi je 95% sve ovo max do 300ks za 6 cilindricni motor.

[M-power]

Da ispade da se ide na skoro 800KS. Vazdusara tesko da drzi.

[SAAB PoWeR]

ako trazis injectore neces nigde jeftinije naci od ovih

http://www.fiveomotorsport.com/Injector_Sets.asp

koje god hoces covek moze nabaviti i najpovoljnija cena

[Miljan3]

Hvala za objasnjenje sta je BSFC ,ali sad sam tacno izgubljen u tim vasim formulama

[206]

S kojim god pritiskom goriva da radi sada, na EFI-ju ce raditi na 3-3.5 bara.

[M-power]

Pa nece....vec je receno da ce raditi najverovatnije na 3,8.
Mislim ispod 3.5 nece se ici sigurno.

I da...da napravi rail kod strugara po tvom uzorku....nece da moze.

[206]

Dobro, eto neka je 3.5, nije 5 ili 6, koliko vec rece da mu radi sad.

A za rail, pa hoce hoce. Nisi video rail koji koristim Nema nikakve bre mudrosti, najobicnija cevka koja se nastavlja jedna u drugu, zasto bi bio problem da se par takvih nastavi i prilagodi bokseru? Na to mislis? Pa zato i kazem, to je otprilike najmanji problem koji moze da ima u celoj prici. Ako je jos i FPR integrisan na pumpi, jos lakse, nema return line.